ASOS is known for its millennial-focused fast-fashion, selling own-brand products alongside brands like Adidas and Polo Ralph Lauren. Two-fifths of sales are own-brand and the company launches 5,000 new products on its site each week. At any one time the company has around 85,000 products in stock.

CEO Nick Beighton said in a statement: "It's been a great year for ASOS, with continued growth in sales and profits. Our international performance was excellent, as we reinvested FX tailwinds and benefitted from our continually improving customer proposition. In a competitive UK market, we achieved strong full price performance whilst further increasing market share."

ASOS said it expects sales to grow by 25-30% in 2018 and said it will accelerate investment in the business as a result of the strong performance. The company plans to spend £200-220 million on capital expenditure next year, with a major new US warehouse planned.

Beighton said: "The investments we are making will see us add 1,000 new heads and will lay the foundations for a c.60% increase in unit capacity and c.£4 billion of net sales."

ASOS had 135.7 million visits across mobile and desktop during August and has 15.4 million active customers globally.

Despite ASOS' strong performance — sales growth was in-line with City forecasts and profit was slightly ahead — shares have opened around 1% lower in London on Tuesday, with investors perhaps taking profit from the strong numbers.